linux-kernel - Re: [PATCH v8 00/21] Compile-time stack validation

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Date:	Tue, 11 Aug 2015 16:31:07 -0500
From:	Chris J Arges <chris.j.arges@...onical.com>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Michal Marek <mmarek@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Pedro Alves <palves@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Bernd Petrovitsch <bernd@...rovitsch.priv.at>, x86@...nel.org,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 00/21] Compile-time stack validation

Josh,

I've applied and tried to build your patchset against the latest
mainline kernel with the following config:
http://paste.ubuntu.com/12058017/

I can build if I disable CONFIG_STACK_VALIDATION, then re-enable it
after all objects are already built, so this seems like it should be
resolvable in Makefiles. Any suggestions for debugging this?

Building from clean I get the following:
~/linux$ make
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/basic/bin2c
  GEN     arch/x86/lib/inat-tables.c
  HOSTCC  arch/x86/tools/relocs_32.o
  HOSTCC  arch/x86/tools/relocs_64.o
  HOSTCC  arch/x86/tools/relocs_common.o
  HOSTLD  arch/x86/tools/relocs
  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  CC      arch/x86/purgatory/purgatory.o
  AS      arch/x86/purgatory/stack.o
  AS      arch/x86/purgatory/setup-x86_64.o
  CC      arch/x86/purgatory/sha256.o
  AS      arch/x86/purgatory/entry64.o
  CC      arch/x86/purgatory/string.o
  LD      arch/x86/purgatory/purgatory.ro
  BIN2C   arch/x86/purgatory/kexec-purgatory.c
  CC      kernel/bounds.s
  CHK     include/generated/bounds.h
  CHK     include/generated/timeconst.h
  CC      arch/x86/kernel/asm-offsets.s
  CHK     include/generated/asm-offsets.h
  CALL    scripts/checksyscalls.sh
  HOSTCC  scripts/genksyms/genksyms.o
  HOSTCC  scripts/genksyms/parse.tab.o
  HOSTCC  scripts/genksyms/lex.lex.o
  HOSTLD  scripts/genksyms/genksyms
  CC      scripts/mod/empty.o
scripts/mod/empty.o
open: No such file or directory
error reading elf file scripts/mod/empty.o
scripts/Makefile.build:284: recipe for target 'scripts/mod/empty.o' failed
make[2]: *** [scripts/mod/empty.o] Error 1
scripts/Makefile.build:429: recipe for target 'scripts/mod' failed
make[1]: *** [scripts/mod] Error 2
Makefile:545: recipe for target 'scripts' failed
make: *** [scripts] Error 2
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